Hi yahoe,
Welcome to Beoworld! The answer your question, no this is not possible. Powerlink sockets are only for speakers. If you want to connect a turntable (via a pre-amp) then this needs to be done via the Aux In (red and white RCA) sockets only. No other socket can be used.
If you are in UK (or if you have a UK shipping address) please feel free to get in touch via my sponsor link below for help with finding the right pre-amp and getting everything connected.
Kind regards, Steve.